Functions in d8 to turn the profiler on/off (enableProfiler() and disableProfiler()).

src/d8.h

Index: src/d8.h
diff --git a/src/d8.h b/src/d8.h
index 28321f56dae720dd2e02d56881132966f53921c7..d0267a7f2f314629f5438d78d43f2144f7611956 100644
--- a/src/d8.h
+++ b/src/d8.h
@@ -248,6 +248,8 @@ class Shell : public i::AllStatic {
   static Handle<Value> Yield(const Arguments& args);
   static Handle<Value> Quit(const Arguments& args);
   static Handle<Value> Version(const Arguments& args);
+  static Handle<Value> EnableProfiler(const Arguments& args);
+  static Handle<Value> DisableProfiler(const Arguments& args);
   static Handle<Value> Read(const Arguments& args);
   static Handle<Value> ReadLine(const Arguments& args);
   static Handle<Value> Load(const Arguments& args);